Hi, thanks for the query.
You were feeling severe dryness in mouth and intense heartburn
Actually these both things were related to antibiotics's side effects and of course were due to salivary gland
In infection these is increase in the temp of body hence dryness in mouth.
When patient take some medicines naturally he will feel some anxiety
and that anxiety produces heartburn.
So your's all problems were interlinked with each other.
I hope till you have recovered from illness. Good luck for healthy life style. Dr. HET